Method for starting-up and shutting-down a gas turbine in a combined gas and steam power plant

Abstract

Provided is a method for starting and stopping a gas turbine in a combined cycle power plan, wherein the gas turbine includes a compressor having adjustable guide vanes and the gas turbine power can also be controlled by opening the guide vanes. When the gas turbine is started, it is driven up to a base load or up to an emission-compliant load point, and the guide vanes are opened before the base load or the emission-compliant load point is reached.

1 . A method for starting-up and shutting-down a gas turbine in a combined gas and steam power plant, wherein the gas turbine comprises a compressor having adjustable guide vanes, and the gas-turbine output power can also be controlled by opening of the guide vanes, wherein the gas turbine, when being started-up, is operated up to base load or up to an emission-compliant load point, wherein the guide vanes are opened before the base load or the emission-compliant load point is attained. 
     
     
         2 . The method as claimed in  claim 1 , wherein the gas turbine ramped-up with a maximum possible load ramp. 
     
     
         3 . The method as claimed in  claim 1 , wherein the guide vanes are closed at the beginning of the start-up operation. 
     
     
         4 . The method as claimed in  claim 1 , wherein the guide vanes are opened as widely as possible, within the scope of the emission specifications. 
     
     
         5 . The method as claimed in  claim 1 , wherein the combined gas and steam power plant comprises an exhaust-gas flue, and emissions are measured continuously in the exhaust-gas flue. 
     
     
         6 . The method as claimed in  claim 1 , wherein temperature sensors are read out continuously during starting-up and shutting-down. 
     
     
         7 . The method as claimed in  claim 6 , wherein the temperature sensors on thick-walled components are read out continuously, i.e. on components having an outer diameter to inner diameter ratio of greater than 1.2.